Cadran équinoxial portatif en bronze argenté et doré, travail allemand, vers 1730-1740, par Antonius Schega

le socle rectangulaire comprenant une boussole et un pendule, gravé des noms de quarante-deux villes européennes et de leurs latitudes, reposant sur trois pieds ; le cadran à deux aiguilles et un alidade, articulé, numéroté deux fois de I à XII et orné de deux cartouches, l'un figurant une allégorie de l'Astronomie et l'autre gravé ANTONIUS/SCHEGHA/Fecit ; (une aiguille probablement d'époque postérieure)

Vente Sotheby's à New York, le 25 avril 1998, lot 233

There is too much contrast on the photograph. The gilt and silvered bronzes are extensively tarnished and rubbed, but look actually more uniform. As said, one handle is probably of later date. Very precise and delicate engraving. Good overall condition. Very attractive scientific instrument, as well as a fine work of art.
"In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective, qualified opinion. Prospective buyers should also refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD AS IS" IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE."

Un cadran très similaire d'Antonius Schega est illustré dans A. Turner, Early scientific instruments, Europe, 1400-1800, Londres, 1987, pl. XVII.